JP2009296768A - Axial gap type motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial gap type motor which facilitates assembly of a rotor and reduces manufacturing cost. <P>SOLUTION: The axial gap type motor 10 includes a structure in which a main magnet portion 41 magnetized in a shaft direction, a pair of magnetic members 42 disposed on both side surfaces of the main magnet portion 41 and sub-magnet portions 43 each disposed between the magnet members 42 adjacent in the circumferential direction are held by supporting plates 44, 45 from the side of the diameter direction to form each of magnetic pole units 30, and the magnetic pole units 30 are each disposed between adjacent ribs 34 of a rotor frame 33. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an axial gap type motor.

  2. Description of the Related Art Conventionally, for example, an axial that includes a pair of stators arranged opposite to each other so as to sandwich the rotor from both sides in the rotation axis direction, and forms a magnetic flux loop via the pair of stators against a field magnetic flux generated by a permanent magnet of the rotor Gap-type permanent magnet synchronous machines are known (see, for example, Patent Document 1 and Patent Document 2).

The rotor of the axial gap type rotating electrical machine according to Patent Document 1 is configured by arranging a plurality of permanent magnets at equal intervals in the circumferential direction on a rotor core formed by laminating electromagnetic steel plates. In addition, the rotor of the rotating electrical machine described in Patent Document 2 is wound with a tape-shaped electromagnetic steel sheet and superimposed, and after embedding a permanent magnet in a hole opened on the outer peripheral surface, the tape-shaped electromagnetic steel sheet is further wound, The end portion is joined to the outer peripheral surface by welding or adhesion.
JP 2005-341696 A JP 2006-166635 A

  Each of the rotors described in Patent Document 1 and Patent Document 2 has a structure in which electromagnetic steel sheets are laminated, but there is no description of a fixing method for a plurality of electromagnetic steel sheets, or a wound body having holes opened on the outer peripheral surface. However, it was difficult to produce. In addition, assembly of a rotor having a large number of permanent magnets and a magnetic member on which electromagnetic steel plates are laminated has a problem that the assembly process is complicated and complicated.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an axial gap type motor in which a rotor can be easily assembled and manufacturing costs can be reduced.

In order to achieve the above object, an invention according to claim 1 includes a rotor that can rotate around a rotation axis (for example, a rotor 11 in an embodiment described later),
A pair of stators (for example, a stator 12 in an embodiment described later) disposed opposite to the rotor from both sides in the rotation axis direction;
An axial gap type motor comprising:
The rotor is
A plurality of ribs (for example, radial ribs 34 in the embodiment described later) that are arranged at predetermined intervals in the circumferential direction and extend in the radial direction, and shaft portions that are respectively provided on the inner diameter side and outer diameter side of the plurality of ribs For example, a rotor frame (for example, a rotor frame 33 in an embodiment described later) including an inner peripheral cylindrical portion 35 in an embodiment described later and a rim portion (for example, an outer cylindrical portion 36 in an embodiment described later). )When,
A main magnet portion (for example, a main magnet portion 41 in an embodiment to be described later) magnetized in the rotation axis direction and disposed between ribs adjacent to each other in the circumferential direction, and both side surfaces of the main magnet portion in the rotation axis direction A pair of magnetic members (for example, a magnetic member 42 in an embodiment described later), and a support plate (for example, an embodiment described later) that holds the main magnet portion and the pair of magnetic members from the side in the radial direction. A plurality of magnetic pole units (for example, a magnetic pole unit 30 in an embodiment described later) that integrate the main magnet portion and the pair of magnetic members by the support plates. ).

The invention according to claim 2 is the axial gap motor according to claim 1, wherein the rotor is magnetized in a direction orthogonal to the rotation axis direction and the radial direction, and on both sides of the rib in the rotation axis direction, It further includes a plurality of sub-magnet portions (for example, sub-magnet portions 43 in the embodiments described later) disposed between the magnetic members adjacent in the circumferential direction,
The support plate further supports the two sub magnet portions so as to sandwich the one magnetic member arranged on one side surface of the main magnet portion in the rotation axis direction in the circumferential direction,
The main magnet portion, the pair of magnetic members, and the two sub magnet portions constitute the magnetic pole unit by the support plate.

  The invention according to claim 3 is the axial gap type motor according to claim 1 or 2, wherein the support plate includes a pair of support plates for holding the main magnet portion and the pair of magnetic members from both sides in the radial direction. The one support plate has a fitting portion (for example, a protrusion 44d in an embodiment described later) that fits with one of the shaft portion and the rim portion.

  According to a fourth aspect of the present invention, in the axial gap type motor according to the third aspect, the one support plate has another fitting portion that fits the magnetic member (for example, a fitting hole in an embodiment described later). 46).

  According to a fifth aspect of the present invention, in the axial gap motor according to the third or fourth aspect, a ring (for example, an implementation described later) is provided between the shaft portion, the other of the rim portion, and the other support plate. It is characterized in that a ring 50) in the form is interposed.

According to a sixth aspect of the present invention, in the axial gap type motor according to the fifth aspect, the other of the shaft portion and the rim portion has an arc-shaped convex portion formed between the ribs (for example, an embodiment described later). The arcuate convex portion 39) is formed,
The other support plate has a positioning part (for example, a positioning part 45e in an embodiment described later) that is bent in the radial direction and is sandwiched between the arc-shaped convex part and the ring.

  The invention according to claim 7 is the axial gap type motor according to claim 3 or 4, wherein the pair of support plates are end surface support surfaces that support a radial end surface of the sub-magnet portion (for example, an embodiment described later). End surface support surfaces 44b, 45b) and side support surfaces that are bent from the end surface support surfaces and support side surfaces different from the radial end surfaces of the sub-magnet portion (for example, 44c, 45c in the embodiments described later). It is characterized by having.

  According to an eighth aspect of the present invention, in the axial gap type motor according to the seventh aspect, the side surface of the sub-magnet portion is provided on a portion supported by the side surface support surfaces of the pair of support plates. A recess having a depth substantially equal to the thickness (for example, a recess 43a in an embodiment described later) is formed.

  According to a ninth aspect of the present invention, in the axial gap type motor according to any one of the first to eighth aspects, the magnetic pole units adjacent in the circumferential direction are inserted into the rotor frame from different directions in the rotational axis direction. It is characterized by that.

  According to the first aspect of the present invention, the rotor can be easily assembled with a small number of man-hours, and the production cost of the rotor can be suppressed and the axial gap motor can be provided at a low cost.

  According to the second and ninth aspects of the present invention, a Halbach type axial gap motor composed of a large number of components can be easily assembled with a small number of man-hours, and the manufacturing cost of the rotor can be suppressed. Thus, for example, in the case of a 6 pole pair Halbach type motor, it is necessary to assemble a total of 60 parts, that is, 12 main magnets, 24 submagnets, and 24 magnetic members as constituent members. These can be integrated into 12 magnetic pole units by unitizing them into magnetic pole units.

  According to the third aspect of the present invention, the magnetic pole unit can be positioned at a predetermined position with respect to the rotor frame and can be securely fixed.

  According to invention of Claim 4, a magnetic member can be reliably hold | maintained with a support plate, and it can be set as a stronger rotor structure.

  According to invention of Claim 5, a magnetic pole unit can be reliably fixed to a rotor frame with a ring.

  According to the sixth aspect of the present invention, even if an axial force is applied to the magnetic pole unit, the magnetic pole unit is prevented from shifting in the axial direction with respect to the rotor frame.

  According to the seventh aspect of the present invention, the sub-magnet portion of the Halbach type motor can be securely held by the support plate.

  According to the eighth aspect of the present invention, the auxiliary magnet portion and the side support surface are made to be the same surface to prevent the axial projection and thereby a high torque can be generated while minimizing the gap between the rotor and the stator.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

(First embodiment)
First, with reference to FIGS. 1-6, 1st Embodiment of the axial gap type motor which concerns on this invention is described.

  As shown in FIGS. 1 and 2, the axial gap type motor 10 according to the present embodiment includes a substantially annular rotor 11 that is rotatably provided around the rotational axis O of the axial gap type motor 10, and an axis of the rotational axis O. A pair of stators 12, 12 each having a plurality of stator windings that are arranged so as to sandwich the rotor 11 from both sides in a direction (hereinafter simply referred to as an axial direction) and generate a rotating magnetic field that rotates the rotor 11. And comprising.

  The axial gap type motor 10 is mounted as a drive source in a vehicle such as a hybrid vehicle or an electric vehicle, for example, and the output shaft is connected to the input shaft of a transmission (not shown), so that the driving force of the axial gap type motor 10 is obtained. Is transmitted to drive wheels (not shown) of the vehicle via a transmission.

  Further, when the driving force is transmitted from the driving wheel side to the axial gap type motor 10 during deceleration of the vehicle, the axial gap type motor 10 functions as a generator, generates a so-called regenerative braking force, and reduces the kinetic energy of the vehicle body. It is recovered as electrical energy (regenerative energy). Further, for example, in a hybrid vehicle, when the rotor 11 of the axial gap type motor 10 is connected to a crankshaft of an internal combustion engine (not shown), the output of the internal combustion engine is transmitted to the axial gap type motor 10 and the axial gap. The mold motor 10 functions as a generator and generates power generation energy.

  Each stator 12 protrudes toward the rotor 11 along the axial direction from a position at a predetermined interval in the circumferential direction on a substantially annular plate-shaped yoke portion 21 and a facing surface of the yoke portion 21 facing the rotor 11. And a plurality of teeth 22,..., 22 extending in the radial direction, and stator windings (not shown) mounted between the appropriate teeth 22, 22.

Each stator 12 is, for example, a 6N type having six main poles (for example, U ⁺ , V ⁺ , W ⁺ , U ⁻ , V ⁻ , W ⁻ ), and each stator 12 has one U ^+. , V ⁺ and W ⁺ poles are set such that the U ⁻ , V ⁻ and W ⁻ poles of the other stator 12 face each other in the axial direction. For example, three teeth 22 of one stator 12 corresponding to one of U ⁺ , V ⁺ , W ⁺ poles and one of U ⁻ , V ⁻ , W ⁻ poles with respect to a pair of stators 12, 12 opposed in the axial direction. , 22, 22 and three teeth 22, 22, 22 of the other stator 12 corresponding to the other of the U ⁺ , V ⁺ , W ⁺ pole and the other of the U ⁻ , V ⁻ , W ⁻ poles, The energized state of the teeth 22 of one stator 12 and the teeth 22 of the other stator 12 that are set so as to face each other and are opposed in the axial direction is set so as to be reversed by an electrical angle.

  As shown in FIG. 2, the rotor 11 includes a plurality of magnetic pole units 30 (12 in the embodiment shown in the figure) and a rotor frame 33 made of a nonmagnetic material, and the magnetic pole unit 30 is placed in the rotor frame 33. Contained.

  As shown in FIGS. 3 and 4, the rotor frame 33 is made of a nonmagnetic material such as stainless steel or aluminum, and is arranged at a predetermined interval in the circumferential direction and extends in the radial direction. On the inner peripheral surface of the inner peripheral side cylindrical portion 35, the inner peripheral side cylindrical portion 35 and the outer peripheral side cylindrical portion 35 connected by the radial ribs 34,. And a connection portion 37 that is formed in an annular plate shape that protrudes inward from the vehicle and is connected to an external drive shaft (for example, an input shaft of a vehicle transmission). In this embodiment, since the inner peripheral cylindrical portion 35 of the rotor frame 33 is connected to an external drive shaft, the inner peripheral cylindrical portion 35 becomes a shaft portion, and the outer peripheral cylindrical portion 36 is a rim. Part.

  On the inner peripheral surface of the outer cylindrical portion 36, annular grooves 38 are formed on both axial sides of the radial rib. An arcuate convex portion 39 is formed between the adjacent radial ribs 34 on the outer peripheral surface of the inner peripheral cylindrical portion 35.

  5 and 6, the magnetic pole unit 30 includes a substantially fan-shaped main magnet portion 41 magnetized in the thickness direction (that is, the axial direction), and the main magnet portion 41 on both sides in the thickness direction. A pair of magnetic members 42 sandwiched from each other, and two sub-magnet portions 43 that are arranged on both sides in the circumferential direction of the magnetic member 42 and are magnetized in a direction orthogonal to the axial direction and the radial direction (that is, substantially circumferential direction); The main magnet part 41, the pair of magnetic members 42, and the two sub magnet parts 43 are arranged in the radial direction (outer peripheral side and inner peripheral side) by the outer support plate 44 and the inner support plate 45, which are a pair of support plates. ) And are integrated and assembled.

  The magnetic member 42 has a configuration in which a plurality of electromagnetic steel plates 42a are laminated in the radial direction, and a substantially arc-shaped recess (in the inner peripheral surface of each electromagnetic steel plate 42a is formed at a substantially central portion of each electromagnetic steel plate 42a. (Not shown), and a substantially arc-shaped convex portion 42b is formed on the outer peripheral surface. These concave portions and convex portions 42b are formed when each electromagnetic steel plate 42a is crimped one by one with a press. When a plurality of electromagnetic steel plates 42a are stacked, the outer peripheral surface convex portion 42b is adjacent to the inner circumference of the adjacent electromagnetic steel plate 42a. They are fitted to the recesses of the surface and positioned relative to each other.

  Further, a chamfered portion 42c is formed by chamfering the radial corner portion which is the outer side in the axial direction of the magnetic member 42. The chamfered portion 42c is configured such that the axial side surfaces of the magnetic member 42 and the sub-magnet portion 43 are continuous without a step, thereby having an effect of reducing cogging torque and torque ripple. The magnetic member 42 may be a sintered member obtained by molding and firing, for example, a powder of iron or the like in addition to the laminated electromagnetic steel plate 42a. Also in this case, the convex part 42b is formed in an outer peripheral surface, and a recessed part is formed in an internal peripheral surface.

  The outer support plate 44 is made of, for example, a nonmagnetic material such as a stainless steel plate, and has a substantially rectangular outer periphery pressing portion 44a that contacts the outer peripheral surfaces of the main magnet portion 41 and the pair of magnetic members 42, and an outer periphery pressing portion. An end surface support surface 44b provided at one end in the axial direction of 44a and extending on both sides in the circumferential direction, and a side support surface 44c formed by bending radially inward from the end surface support surface 44b. The end surface support surface 44 b supports the outer peripheral surface of the sub magnet part 43, and the side surface support surface 44 c supports the axial side surface of the sub magnet part 43.

  A pair of fitting holes 46 are formed in the outer periphery pressing portion 44 a of the outer support plate 44 at positions corresponding to the convex portions 42 b of the magnetic member 42. In addition, four projecting portions 44d cut outward in the radial direction are formed at both ends in the axial direction. When the magnetic pole unit 30 is assembled to the rotor frame 33, the projecting portions 44d are formed on the outer cylindrical portion. It is positioned by fitting into 36 annular grooves 38.

  The inner support plate 45 is formed of a nonmagnetic material such as a stainless steel plate, for example, like the outer support plate 44, and has a substantially T-shape that contacts the inner peripheral surfaces of the main magnet portion 41 and the pair of magnetic members 42. Of the inner circumferential holding portion 45a, an end surface supporting surface 45b provided at one end in the axial direction of the inner circumferential holding portion 45a and extending on both sides in the circumferential direction, and a side surface formed by bending outward from the end surface supporting surface 45b in the radial direction. And a support surface 45c. A pair of fitting convex portions 45d that fit into the concave portions are formed in the inner circumferential pressing portion 45a at positions corresponding to the concave portions formed on the inner peripheral surface of the magnetic member 42. Further, the base portion of the inner circumferential holding portion 45a formed in a substantially T-shape is provided with a positioning portion 45e that is formed to bend radially inward.

The main magnet unit 41, the pair of magnetic members 42, and the two sub magnet units 43 are held from both sides in the radial direction by the outer support plate 44 and the inner support plate 45 to form a magnetic pole unit 30. That is, the outer support plate 44 fits the projections 42b of the pair of magnetic members 42 holding the main magnet portion 41 from both sides into the fitting holes 46, and the end surfaces and side surfaces of the two sub magnet portions 43 are end surfaces. The inner support plate 45 is in contact with the inner peripheral surface side of the main magnet portion 41, the pair of magnetic members 42, and the two sub magnet portions 43, and is held between the support surface 44b and the side support surface 44c. To do. At this time, the pair of fitting convex portions 45d of the inner support plate 45 are fitted and positioned in the concave portions of the pair of magnetic members 42, respectively.
In the present embodiment, the main magnet portion 41, the pair of magnetic members 42, and the two sub magnet portions 43 are fixed to the outer support plate 44 and the inner support plate 45 by adhesion. When the member 42 is caulked, the outer support plate 44 may be fixed simultaneously.

  As shown in FIGS. 3 and 4, the magnetic pole units 30 assembled in this way are assembled by inserting the magnetic pole units 30 adjacent in the circumferential direction into the rotor frame 33 from different directions in the axial direction. At this time, the main magnet parts 41 and 41 adjacent in the circumferential direction are set so that the magnetization directions are different from each other.

  Specifically, the magnetic pole unit 30 is inserted from the side into a space defined by the outer peripheral cylindrical portion 36, the inner peripheral cylindrical portion 35, and the radial ribs 34, 34. The projecting portion 44d and the convex portion 42b of the magnetic member 42 are engaged with the annular groove 38 of the outer peripheral side cylindrical portion 36 and brought into contact with the inner peripheral surface of the outer peripheral side cylindrical portion 36.

  Thus, the main magnet portion 41 is sandwiched between the inner circumferential side cylindrical portion 35 and the outer circumferential side cylindrical portion 36 from both sides in the radial direction and is sandwiched from both sides in the circumferential direction by the two radial ribs 34. Further, the two sub magnet parts 43 are sandwiched between the inner peripheral side cylindrical part 35 and the outer peripheral side cylindrical part 36 from both sides in the radial direction, and are positioned on one axial side of the radial rib 34.

  Next, the ring 50 is press-fitted in the axial direction between the inner support plate 45 and the inner peripheral cylindrical portion 35, and the positioning portion 45 e of the inner support plate 45 is held between the arc-shaped convex portion 39 and the ring 50. To do. This prevents the magnetic pole unit 30 from coming out of the rotor frame 33 against the axial force applied to the magnetic pole unit 30. The magnetic pole unit 30 receives a suction force from a pair of stators 12 and 12 arranged on both sides. However, if the magnetic pole unit 30 is at an intermediate position between the pair of stators 12 and 12, the suction forces from both sides are balanced. Is in a state. Therefore, the rotor frame 33 has a sufficient strength against centrifugal force and the like acting during rotation, and is positioned at an intermediate position between the pair of stators 12 and 12.

  As described above, according to the axial gap type motor 10 according to the present embodiment, the magnetic pole unit 30 includes the main magnet portion 41, the pair of magnetic members 42 disposed on both side surfaces of the main magnet portion 41, and the circumferential portion. Since the two sub-magnet portions 43 arranged between the magnetic members 42 adjacent to each other in the direction are held and unitized by the support plates 44 and 45, a Halbach type axial gap type composed of a large number of components. The motor 10 can be easily assembled with less man-hours. In addition, this makes it possible to provide the axial gap motor 10 at a low cost while suppressing the manufacturing cost of the rotor 11. Thereby, for example, in the case of the Halpole type motor 10 of 6 pole pairs, 12 main magnet parts 41, 24 sub magnet parts 43, and 24 magnetic members 42 which are constituent members are unitized. Thus, the twelve magnetic pole units 30 can be assembled.

  As a first modification of the first embodiment, as shown in FIG. 7, the rotor 11 has an inner peripheral cylindrical portion (shaft portion) of the rotor frame 33 as a separate member, and the separate member is bolted. Thus, the magnetic pole unit may be fixed. That is, the rotor 11 includes a pair of ring members 55 having a substantially L-shaped cross section provided separately from the connection portion 37. A pressing recess 56 for accommodating the positioning portion 45e is formed in a ring shape at the outer peripheral side corner portion of the ring member 55.

  Therefore, in the rotor 11, as in the first embodiment, the protrusion 44d of the outer support plate 44 and the protrusion 42b of the magnetic member 42 are engaged with the annular groove 38 of the outer cylindrical portion 36, thereby making the magnetic pole unit. 30 is inserted into the rotor frame 33. Then, the ring member 55 is brought into contact with the inner peripheral surface of the inner support plate 45, and the ring member 55 is fixed to the connection portion 37 with a bolt 57. Thereby, the positioning portion 45 e of the inner support plate 45 is held between the connection portion 37 and the ring member 55, and the magnetic pole unit 30 is fixed to the rotor frame 33.

  Further, as a second modification of the first embodiment, as shown in FIG. 8, the auxiliary magnet portion 43 is provided with a concave portion 43 a having substantially the same depth as the plate thickness of the support plates 44 and 45 at both ends in the axial direction. May be formed. Thereby, since the sub magnet part 43 is hold | maintained by the side surface support surfaces 44c and 45c which contact | abut to the recessed part 43a, the axial direction side surface of the sub magnet part 43 and the side surface support surfaces 44c and 45c becomes the same surface, and a side surface support surface 44 c and 45 c do not protrude from the sub magnet part 43. Thereby, the gap between the rotor 11 and the stator 12 can be reduced to generate a high torque.

(Second Embodiment)
Next, an axial gap type motor according to a second embodiment of the present invention will be described with reference to FIGS. The axial gap type motor of the second embodiment is different from the axial gap type motor of the first embodiment in the structure of the positioning portion of the inner support plate. For this reason, the same or equivalent parts as those in the first embodiment are denoted by the same or corresponding symbols, and description thereof is simplified or omitted.

  As shown in FIGS. 9 to 11, the rotor 11 of the axial gap motor of the second embodiment includes a plurality (12 in the embodiment shown in the drawings) of magnetic pole units 130 and a rotor frame 33 made of a nonmagnetic material. , And the magnetic pole unit 130 is accommodated in the rotor frame 33. The magnetic pole unit 130 is configured by holding the main magnet portion 41, the pair of magnetic members 42, and the two sub magnet portions 43 by the outer support plate 44 and the inner support plate 145.

  An arc-shaped convex portion 39 provided on the inner circumferential cylindrical portion 35 of the rotor frame 33 is formed with an axial groove 61 penetrating in the axial direction substantially in the middle of the adjacent radial ribs 34. In addition, the inner support plate 145 has a pair of positions cut inward in the radial direction corresponding to the axial grooves 61 of the arcuate convex portions 39, that is, the positions corresponding to the main magnet portions 41 of the inner circumferential pressing portion 45a. A rib-shaped positioning portion 45f is provided. These positioning portions 45f are circumferential in the plate thickness direction and extend along the axial direction.

As shown in FIG. 10, the magnetic pole unit 130 having such an inner support plate 145 has an outer peripheral side tubular portion 36 and an inner peripheral side of the rotor frame 33 with the positioning portion 45 f fitted in the axial groove 61. The ring 50 is inserted between the cylindrical portion 35 and the inner support plate 145 and the inner peripheral cylindrical portion 35 are press-fitted from both sides in the axial direction. It is pinched by the ring 50. Thereby, the magnetic pole unit 130 is fixed to the rotor frame 33.
In addition, about another structure and effect | action, it is the same as that of the axial gap type motor 10 of 1st Embodiment.

(Third embodiment)
Next, a third embodiment of the axial gap motor according to the present invention will be described with reference to FIGS. In the axial gap type motors of the first and second embodiments, the Halbach type motor provided with the auxiliary magnet portion has been described. However, the axial gap type motor of the third embodiment does not include the auxiliary magnet portion, and the magnetic pole unit. Is composed of a main magnet portion, a pair of magnetic members disposed on both side surfaces of the main magnet portion, and inner and outer support plates. Since the other parts are the same as those of the axial gap type motor according to the first embodiment of the present invention, the same or equivalent parts are denoted by the same or corresponding numerals, and the description thereof is simplified or omitted.

  As shown in FIGS. 12 and 13, the magnetic pole unit 230 of this embodiment includes a substantially sector plate-shaped main magnet portion 41 magnetized in the axial direction and a pair of sandwiching the main magnet portion 41 from both sides in the thickness direction. The main magnet portion 41 and the pair of magnetic members 42 are held by the outer support plate 244 and the inner support plate 245 from the side in the radial direction (outer peripheral side and inner peripheral side) and integrated with each other. It is assembled.

  The outer support plate 244 and the inner support plate 245 have end surface support surfaces 44b and 45b and side surface support surfaces 44c and 45c, respectively, with respect to the outer support plate 44 and the inner support plate 45 of the first embodiment shown in FIG. It is formed in a shape that does not.

  That is, the outer support plate 244 is made of, for example, a non-magnetic material such as a stainless steel plate, and includes a substantially rectangular outer periphery pressing portion 44a that contacts the outer peripheral surfaces of the main magnet portion 41 and the pair of magnetic members 42, A pair of fitting holes 46 that are fitted to the convex portions 42b of the magnetic member 42 and four radial grooves that are cut outward in the radial direction and are fitted into the annular groove 38 of the rotor frame 33. Projection 44d is formed at the axial end.

  The inner support plate 245 is formed of a non-magnetic material such as a stainless steel plate, for example, and has a substantially T-shaped inner peripheral holding portion 45a that abuts on the inner peripheral surfaces of the main magnet portion 41 and the pair of magnetic members 42. A pair of fitting convex portions 45d that fits into the concave portions formed on the inner circumferential surface of the magnetic member 42 are formed on the inner circumferential pressing portion 45a. Further, the base portion of the inner circumferential holding portion 45a formed in a substantially T-shape is provided with a positioning portion 45e that is formed to bend radially inward.

In such a magnetic pole unit 230, as shown in FIG. 12, the magnetic pole units 230 adjacent in the circumferential direction are inserted into the rotor frame 33 from different directions in the axial direction, and the inner support plate 245 and the inner peripheral side cylindrical portion are inserted. The ring 50 is press-fitted between the shaft 35 and the shaft 35 in the axial direction. Accordingly, the positioning portion 45e of the inner support plate 245 is sandwiched and fixed by the arcuate convex portion 39 and the ring 50.
Other configurations and operations are the same as those of the axial gap motor 10 of the first embodiment.

(Fourth embodiment)
Next, an axial gap type motor according to a fourth embodiment of the present invention will be described with reference to FIGS. The axial gap type motor of the fourth embodiment is the same as the axial gap type motor of the third embodiment except that the positioning structure of the inner support plate is the same as that of the magnetic pole unit of the second embodiment. For this reason, the same or equivalent parts as those in the third embodiment are denoted by the same or corresponding reference numerals, and description thereof is simplified or omitted.

  As shown in FIGS. 14 and 15, the magnetic pole unit 330 of the present embodiment is similar to the third embodiment in that the main magnet portion 41 and the pair of magnetic members 42 are separated by an outer support plate 244 and an inner support plate 345. It is comprised by hold | maintaining from radial direction side (an outer peripheral side and an inner peripheral side).

  An axial groove 61 is formed in the arcuate convex portion 39 provided on the inner circumferential cylindrical portion 35 of the rotor frame 33 at substantially the middle between the adjacent radial ribs 34, 34. In addition, the inner support plate 345 that holds the main magnet portion 41 and the pair of magnetic members 42 together with the outer support plate 244 from both sides in the radial direction is located at a position corresponding to the axial groove 61 of the arc-shaped convex portion 39 in the thickness direction. A pair of positioning portions 45f cut inward in the radial direction is provided.

  The magnetic pole unit 330 is inserted between the outer peripheral cylindrical portion 36 and the inner peripheral cylindrical portion 35 of the rotor frame 33 with the positioning portion 45f fitted in the axial groove 61, and is press-fitted from both axial sides. The positioning portion 45f is sandwiched and fixed by the pair of rings 50.

Since the magnetic pole unit 330 of this embodiment is substantially symmetrical in the axial direction, unlike the rotors 11 of the first to third embodiments, the magnetic pole units 30 adjacent in the circumferential direction are mutually connected in the axial direction. It is not necessary to insert into the rotor frame 33 from different directions, and the rotor frame 33 can be inserted from any one axial direction. The inner support plate 345 is formed in a substantially T shape as in the above embodiment, but is symmetrical in the axial direction along the shape of the lower surface of the main magnet portion 41 and the pair of magnetic members 42. May be formed.
Since other configurations and operations are the same as those of the axial gap motor 10 of the third embodiment, the description thereof is omitted.

In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
In the present invention, the fitting portion that fits the shaft portion or the rim portion of the rotor frame may be provided on either the outer support plate or the inner support plate. However, when the rotor rotates, the magnetic pole unit has a radial direction. Since centrifugal force acts outward, it is preferable to fit the outer support plate with the rim portion of the rotor frame in order to stably support the magnetic pole unit.

  Further, in the present invention, a ring may be interposed between the other member of the shaft portion or the rim portion and the support plate into which the fitting portion is fitted, but similarly, due to the centrifugal force acting on the magnetic pole unit, It is preferable to insert a ring between the shaft portion and the inner support plate and fix the magnetic pole unit in contact with the rim portion.

It is a whole perspective view for demonstrating the axial gap type motor which concerns on 1st Embodiment of this invention. It is a disassembled perspective view of the axial gap type motor shown in FIG. It is a longitudinal cross-sectional view of the rotor shown in FIG. FIG. 3 is an exploded perspective view of the rotor shown in FIG. 2. It is an expansion perspective view of the magnetic pole unit shown in FIG. FIG. 6 is an exploded perspective view of the magnetic pole unit shown in FIG. 5. It is a longitudinal cross-sectional view of the rotor of the 1st modification of 1st Embodiment. It is an expansion perspective view of the magnetic pole unit of the 2nd modification of 1st Embodiment. It is a partial fracture exploded perspective view for explaining an axial gap type motor concerning a 2nd embodiment of the present invention. FIG. 10 is a longitudinal sectional view of the rotor shown in FIG. 9. FIG. 10 is an exploded perspective view of the magnetic pole unit shown in FIG. 9. It is a disassembled perspective view for demonstrating the axial gap type motor which concerns on 3rd Embodiment of this invention. It is a disassembled perspective view of the magnetic pole unit shown in FIG. It is a partial fracture exploded perspective view for explaining an axial gap type motor concerning a 4th embodiment of the present invention. It is a disassembled perspective view of the magnetic pole unit shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Axial gap type motor 11 Rotor 12 Stator 30, 130, 230, 330 Magnetic pole unit 33 Rotor frame 34 Radial direction rib 35 Inner peripheral side cylindrical part (shaft part)
36 Outer peripheral side cylindrical part (rim part)
39 Arc-shaped convex part 41 Main magnet part 42 Magnetic member 43 Sub magnet part 43a Concave part 44,244 Outer support plate (support plate)
44b End surface support surface 44c Side surface support surface 44d Projection (fitting portion)
45, 145, 245, 345 Inner support plate (support plate)
45b End support surface 45c Side support surface 45d Fitting convex part (other fitting part)
45e Positioning part 45f Positioning part 46 Fitting hole (other fitting part)
50 Ring O Rotating shaft

Claims (9)

A rotor rotatable around a rotation axis;
A pair of stators opposed to the rotor from both sides in the direction of the rotation axis;
An axial gap type motor comprising:
The rotor is
A rotor frame comprising a plurality of ribs arranged in the circumferential direction at predetermined intervals and extending in the radial direction, and a shaft portion and a rim portion respectively provided on an inner diameter side and an outer diameter side of the plurality of ribs;
A main magnet portion magnetized in the rotation axis direction and disposed between ribs adjacent to each other in the circumferential direction; a pair of magnetic members disposed on both side surfaces of the main magnet portion in the rotation axis direction; Each having a magnet part and a support plate for holding the pair of magnetic members from the side in the radial direction;
A plurality of magnetic pole units that integrate the main magnet portion and the pair of magnetic members by the support plate;
An axial gap type motor comprising: The rotor is magnetized in a direction orthogonal to the rotation axis direction and the radial direction, and has a plurality of sub-magnet portions disposed between adjacent magnetic members in the circumferential direction on both sides of the rib in the rotation axis direction. In addition,
The support plate further supports the two sub magnet portions so as to sandwich the one magnetic member arranged on one side surface of the main magnet portion in the rotation axis direction in the circumferential direction,
2. The axial gap motor according to claim 1, wherein the main magnet part, the pair of magnetic members, and the two sub magnet parts constitute the magnetic pole unit by the support plate. The support plate includes a pair of support plates that hold the main magnet portion and the pair of magnetic members from both radial sides,
3. The axial gap motor according to claim 1, wherein the one support plate includes a fitting portion that fits with one of the shaft portion and the rim portion. 4.   The axial gap type motor according to claim 3, wherein the one support plate further includes another fitting portion that is fitted to the magnetic member.   5. The axial gap motor according to claim 3, wherein a ring is interposed between the shaft portion, the other of the rim portion, and the other support plate. 6. On the other of the shaft part and the rim part, an arc-shaped convex part formed between the ribs is formed,
6. The axial gap motor according to claim 5, wherein the other support plate has a positioning portion that is bent in the radial direction and is sandwiched between the arc-shaped convex portion and the ring.   The pair of support plates includes an end surface support surface that supports a radial end surface of the sub-magnet portion, and a side support surface that is bent from the end surface support surface and supports a side surface different from the radial end surface of the sub-magnet portion. The axial gap type motor according to claim 3 or 4, characterized by comprising:   The concave portion having a depth substantially equal to the thickness of the support plate is formed on the side surface of the sub-magnet portion at a portion supported by the side support surfaces of the pair of support plates. The axial gap type motor according to claim 7.   The axial gap motor according to claim 1, wherein the magnetic pole units adjacent in the circumferential direction are inserted into the rotor frame from different directions in the rotation axis direction.

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